*{
    margin: 0;
    padding: 0;
}

#main {
    width: 520px;
    height: 574px;
    margin: 10px auto;
    position: relative;
}

nav {
    width: 520px;
    height: 50px;
    border-radius: 5%;
    background-color: #ddffab;
}

nav ul li {
    width: 60px;
    height: 50px;
    border-radius: 10%;
    background: #acdeff;
    cursor: pointer;
    float: left;
    list-style-type: none;
    text-align: center;
    line-height: 50px;
}

.on{
    border-bottom: 2px red solid;
}

#imgMap{
    width: 492px;
    height: 474px;
    border: 1px solid cyan;
    overflow: hidden;
    position: absolute;
    margin-left: 14px;
    margin-top: 10px;
}

#imgMap div{
    display: none;
}

#imgMap .show{
    display: block;
}
